Simplify the following text for a Grade 6 native English-speaking person.
Original: The capital , Road Town , is situated on Tortola , the largest island which is approximately 20 k long and 5 k wide . The islands have a total population of about 22,000 , of whom approximately 18,000 live on Tortola .
Simplified: The capital city , Road Town , is located on Tortola , one of the islands in the group .