Somalia
Since we cannot see the map you're looking at - we cannot help you !
The letter E commonly represents Ecuador on maps.
Peru
500 is represented by the letter D, a letter that isn't that often seen.
The letter "D" identifies the location of the Aztec civilization on the map.
In Roman Numerals 500 is represented by a D.
The letter D is usually represented simply as a capital D, with or without quotes to show that it indicates the letter. The sound can be spelled out as "Deez Nutz". "GOTEEM".
Distance.
D
No country in Asia begins with the letter D.
A diatonic semitone is usually represented by the adjacent letter names. The next higher letter pitch to C is D. The answer is D (natural).
The Roman numeral of D represents 500 and not 10 which is represented by the numeral of X