Highest and lowest geography

They say that the Earth's surface is smoother than that of a billiard ball, but still our planet's topography manages to range vastly in its highs and lows. Can you name some of the highest, lowest, and deepest points and things on the earth's surface? Though this quiz only deals with things on earth, there are plenty of interesting highs and lows beyond our planet too!
Answers may include both natural and artificial geographical points.
Unless otherwise stated, height/depth is given as altitude relative to sea level.
When talking about 'deep' things, their depths are maximum depths.
There are many different contenders for 'highest mountain', depending on criteria. Try this Highest Mountains by type quiz to learn more.
Quiz by HelveticaBold
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Last updated: September 11, 2016
First submittedSeptember 11, 2016
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Height/depth
Answer
Highest point on land above sea level
29,030 ft
Mount Everest
Lowest point on land below sea level
−1,388 ft
Dead Sea
Highest point from the centre of the earth
20,703 ft
Mount Chimborazo
Deepest point on earth's surface
35,814 ft deep
Challenger deep
Deepest point on the earth's surface not underwater
8,330 ft deep
Bentley Subglacial Trench, Antarctica
Deepest point underground (deepest cave)
7,208 ft deep
Krubera Cave
Highest capital city
11,913 ft
La Paz
Lowest capital city
-92 ft
Baku
 
Height/depth
Answer
Highest human settlement
16,732 ft
La Rinconada
Country with highest low point
4,593 ft
Lesotho
Country with highest average elevation
8,000 ft
Bhutan
Deepest river
820 ft deep
Congo River
Deepest lake
5,387 ft deep
Lake Baikal
Highest unclimbed mountain
24,836 ft
Gangkhar Puensum
Deepest hole ever drilled
40,230 ft deep
Kola Superdeep Borehole
+1
Level 80
Sep 11, 2016
Ice is water.
+1
Level 69
Sep 12, 2016
You may be right, but if you want to be pedantic then so are clouds :-)