The cities of the 10th Meridian East includes many nations and many cities.
This flag reads 10 Degrees East by 3 Degrees North, which contains Edea, Cameroon.
This flag read 10 Degrees East by 42 Degrees North, which contains Elba, Italy.
This flag reads as 10 Degrees East by 12 Degrees North, which contains Nguru, Nigeria.
This flag read 10 East by 36 Degrees North, which contains Tunis, Tunisia.
This flag read 10 Degrees East by 59 Degrees North, which contains Oslo, Norway.
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For contrast, here are the flags for places on the 10th Meridian West, which still includes Europe and Africa.
The Geographic flag for 10 Degrees West by 6 Degrees North contains Monrovia, Liberia.
The Geographic flag for 10 Degrees West by 52 Degrees North contains Dingle Bay, Ireland.