This is a perfect example of why the position can be very uncertain if we don't know
whether you mean 'east' or 'west' longitude. Fortunately, you're not calling the Coast
Guard with these coordinates and asking to be rescued.
15° South latitude / 90° East longitude
This point is in the Indian ocean, about 1,100 miles from the nearest point of land
in Indonesia.
15° South latitude / 90° West longitude
This point is in the Pacific Ocean, almost 900 miles off the coast of Peru.
The two points are a little over 10,000 miles apart, and from your description,
there is absolutely no way to know which one you have in mind.
The location at 10 degrees south latitude and 75 degrees east longitude is in the Indian Ocean.
The South Pacific Ocean.
Arabian ocean
The Southern Ocean.
The Indian Ocean.
The city located at 19 degrees south latitude and 175 degrees west longitude is Nuku’alofa, the capital of Tonga in the South Pacific.
The city located at 6 degrees south latitude and 106 degrees west longitude is Lima, the capital of Peru.
Latitude 24.37 S Longitude 128.33 W
10 S 10 E is the South Atlantic Ocean, off the West coast of Africa.
INDIAN OCEAN
Seychelles is located at approximately 4.62 degrees south latitude and 55.45 degrees east longitude in the Indian Ocean.
A location at 0 degrees latitude and 90 degrees west longitude is located in the middle of the Atlantic Ocean, near the coast of South America.