Mount Tambora is located in Sumbawa, Lesser Sunda Islands, Indonesia.

Sumbawa, Lesser Sunda Islands,Indonesia

In Indonesia among the Lesser Sunda Islands.

the answer is Timor

They all belong to the Lesser Sunda islands.

Most Indonesia islands have Christians on them. Sumatra- 11%

Java- 4%

Bali - 1%

West Lesser Sunda Islands- 0.2 %

East Lesser Sunda Islands - 83 %

Kalimantan - 19 %

Sulawesi - 16 %

Maluku - 41 %

Papua - 73 %

.....and there are 4000 more inhabited islands,but these are the main ones. Source-Operation World 2001