Features

100 Largest World Islands

Name the 100 largest islands in the world. No need to type in 'Island' for the answers.

Try other geographies:
100 Largest Europe Islands | 100 Largest Oceania Islands
100 Largest US Islands (Excluding AK) | 100 Largest Asia Islands

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12873

100 Largest World Islands By Population

Name the 100 largest islands (continental land-masses not included) based on estimated population. Peninsulas connected by narrow isthmuses are not included. Total population and continent (geographical, not political) shown.

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6464

100 Largest World Lakes

Name the 100 largest lakes in the world. No need to type in 'lake' as part of the answer.

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2876

100 Tallest World Mountains By Prominence

Name the world's 100 highest summits according to prominence...Prominence is the elevation of a summit relative to the highest point to which one must descend before reascending to a higher summit. Think of it as the height of a mountain relative to the closest higher mountain. So a mountain that is the highest of anything nearby will have a high prominence, while nearby mountains that are close but not as tall will have a relatively low prominence. No need to type Mt/Mount/etc.

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1734

100 Tallest World Mountains By Prominence Identifier

Double-click on the light-blue marker of the mountain listed (among the top 100 tallest by prominence - see note below). Correct guesses will change the marker to green – incorrect will not change any marker. Complete all mountains to save your score.

Prominence is the elevation of a summit relative to the highest point to which one must descend before reascending to a higher summit. Think of it as the height of a mountain relative to the closest higher mountain. So a mountain that is the highest of anything nearby will have a high prominence, while nearby mountains that are close but not as tall will have a relatively low prominence.

If by chance you don’t see markers, try refreshing the quiz.

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251

50 Longest & Shortest Country Borders

Name the pairs of countries with the 50 longest and shortest land borders. Border lengths are total length of those countries' borders, not lengths of individual segments. Dependent territories are included as part of the main country (answer the name of the country which claims it). Any border across land is included, including artificial land. Bridges/tunnels are excluded. Use the following abbreviations for these four countries: US, UK, DRC & CAR. Answer by typing in both countries in either order (i.e. 'FranceGermany' or 'AustriaCzech').

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4930

Largest Transboundary Lakes By Area

Name the largest transboundary lakes (including reservoirs) which contain country borders by area. Area in sq km and continent shown. No need to enter words like 'Lake' or 'Reservoir.'

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416

Most Remote Islands & Archipelagos

Name the world islands (or small island groups) and archipelagos which are at least 500 km from the closest other landmass. Distance to closest landmass and location of island/archipelago shown.

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617

UNESCO World Heritage Site Parks

Name the parks which are classified as UNESCO World Heritage Sites. You only are looking to name the park (usually a National Park, but occasionally something smaller). Green markers are for Natural sites, yellow for Cultural, and orange for Mixed (Natural & Cultural). Occasionally a group of parks is counted as one World Heritage Site - you only need to name one of them.

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330

World 100 Largest Islands Identifier

Double-click on the light-blue marker of the world island listed (among the top 100 largest islands by area). Correct guesses will change the marker to green – incorrect will not change any marker. Complete all islands to save your score.

If by chance you don’t see markers, try refreshing the quiz.

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625

World 50 Countries With Highest Max Elevation Elimination

Name the countries whose highest point (including its territories) is in the top 50 of all country highest points. Naming a country outside the top 50 will end the quiz. Max elevation in meters shown.

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7012

World 50 Countries With Lowest Max Elevation Elimination

Name the countries whose highest point (including its territories) is in the bottom 50 of all country highest points. Naming a country outside the bottom 50 will end the quiz. Max elevation in meters shown. One country which is outside the bottom 50 does not answer as typing it is necessary to type in a country which is inside the bottom 50.

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3597

World Bordering Country Challenge

Type a country which has a land border (including causeways but not including only man-made structures) with another country (there are 160 such countries). When entered, that country and any bordering countries will fill in. Try to fill in all 160 countries in as few guesses as possible. NOTE: for Guinea, Niger and UK, type a '.' after them to submit (to avoid answering Guinea Bissau, Nigeria or Ukraine with an extra guess if you didn't want to answer those). Sorted from most bordering countries to fewest, then alphabetically. # of bordering countries shown.

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493

World Countries With Longest Coastlines

Name the 50 countries with the longest total coastlines - this includes their dependent territories.

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2861

World Country Borders

Name all of the country land borders in the world. Dependent territories included. Distances are overall between the two countries, not individual segments. Borders included over man-made land, but not bridges/tunnels. Enter countries one after the other in either order, i.e. 'FranceGermany' or 'USCanada' - use the following abbreviations for these countries: US, UK, DRC, CAR, UAE, and just 'Congo' for Republic of the Congo.

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3453

World Gulfs & Bays

Name the world gulfs and bays designated by the markers on the map. Some are classified as harbors/fjords as well.

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203

World Highest Countries By Average Elevation

Name the 50 world countries which have the highest average elevation (not including overseas territories). Average elevation in meters shown.

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1650

World Island Countries

Name the island countries of the world. Population shown.

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1693

World Largest Cities On Islands

First choose the number of cities by typing '100', '250', '500', or 'all' - then try to achieve the highest population among 50K+ world cities located on islands. Quiz is not timed. City must be entirely on an island to count.

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1744

World Largest Coastal Cities

First choose the number of cities by typing ‘100’, ‘250’, ‘500’, or ‘all’ – then try to achieve the highest population among the top World 50K+ population coastal cities you chose. For purposes of this quiz, coastal refers to cities whose coordinate I use is within a certain distance of a detailed world coastlines boundary shape. Cities must be within 25km for 1M+ pop, 20km 500K-1M, 15km 250-500K, 10km 100-250K, and 5km for 50-100K. Quiz is not timed. Map is only zoomable to a certain level, otherwise city labels would appear.

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1291

World Largest Urban Centres By River Basin

Name the largest urban centre for each river basin it is classified as being in. Urban centres are defined by the European Commission at the link below. Occasionally an urban centre name isn’t a city name, but rather a country/district/area. River basin and population shown. FYI - river basins are often very large areas around a river, and the city may be a good distance away from the actual river.

https://ghsl.jrc.ec.europa.eu/ghs_stat_ucdb2015mt_r2019a.php

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476

World Longest Rivers

Name the 100 longest rivers in the world. Try to name the most common name of one of the main stems. Markers are at the mouths of the river systems.

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2168

World Lowest Countries By Average Elevation

Name the 50 world countries which have the lowest average elevation (not including overseas territories). Average elevation in meters shown.

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1250

World Sea Areas

Name the 101 world sea areas per the International Hydrographic Organization. Seas may refer to oceans, gulfs, bays, etc. You typically do not have to type in such things as 'sea of' or 'ocean'.

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3476

World Straits

Name the world straits designated by the markers on the map. Some are classified as channels/passages/gulfs/etc. Just answer with the main name (no need for 'Strait of').

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240