Nigeria vs Tanzania

Tanzania and Nigeria are almost exactly the same size.

NigeriaTanzaniaNigeria moved onto Tanzania · Equal-area projection
0.98×
Nigeria is 0.98× the area of Tanzania. Put the other way, Tanzania is 1.03× the size of Nigeria.
NigeriaTanzania
Area923,768 km²947,303 km²
Population237,527,78270,545,865
Density257 / km²74 / km²
CapitalAbujaDodoma
RegionWestern AfricaEastern Africa
CoastlineHas a coastHas a coast
Neighbours48

Why the map you grew up with disagrees

On a Mercator map, area grows with distance from the equator. Nigeria sits at about 10°N and is stretched to 1.03× its true area; Tanzania at 6° S is stretched to 1.01×. 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 Nigeria bigger than Tanzania?
No. Nigeria and Tanzania are almost exactly the same size. Nigeria covers 923,768 km² and Tanzania covers 947,303 km².
How many times does Nigeria fit into Tanzania?
About 1.0 times: Tanzania has 1.03× the area of Nigeria.
Why do Nigeria and Tanzania look different on Google Maps?
Web maps use the Mercator projection, which stretches area with distance from the equator. Nigeria is drawn about 1.03× its true area there and Tanzania about 1.01×. 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, Nigeria or Tanzania?
Nigeria: 237,527,782 people against 70,545,865. Density: Nigeria 257 per km², Tanzania 74 per km².