Mauritania vs Nigeria

Mauritania is 12% larger than Nigeria.

MauritaniaNigeriaMauritania moved onto Nigeria · Equal-area projection
1.12×
Mauritania is 1.12× the area of Nigeria.
MauritaniaNigeria
Area1,030,700 km²923,768 km²
Population5,315,065237,527,782
Density5.2 / km²257 / km²
CapitalNouakchottAbuja
RegionWestern AfricaWestern Africa
CoastlineHas a coastHas a coast
Neighbours44

Why the map you grew up with disagrees

On a Mercator map, area grows with distance from the equator. Mauritania sits at about 20°N and is stretched to 1.14× its true area; Nigeria at 10° N is stretched to 1.03×. Here the two are distorted about the same amount, so Mercator gets this pair roughly right. The figure above uses the Equal Earth projection, where every square kilometre is drawn the same size.

Questions about this pair

Is Mauritania bigger than Nigeria?
Yes. Mauritania is 12% larger than Nigeria. Mauritania covers 1,030,700 km² and Nigeria covers 923,768 km².
How many times does Nigeria fit into Mauritania?
About 1.1 times: Mauritania has 1.12× the area of Nigeria.
Why do Mauritania and Nigeria look different on Google Maps?
Web maps use the Mercator projection, which stretches area with distance from the equator. Mauritania is drawn about 1.14× its true area there and Nigeria about 1.03×. For this pair the distortion is similar, so Mercator gets the comparison roughly right. Kartavera uses Equal Earth, where every square kilometre is drawn the same size.
Which has more people, Mauritania or Nigeria?
Nigeria: 237,527,782 people against 5,315,065. Density: Mauritania 5.2 per km², Nigeria 257 per km².