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One former Greenpeace boat has a new lease on life. It navigates the rivers of Bangladesh, providing a health care service to people in remote areas.

Around 700 rivers are constantly shaping Bangladesh's landscape - building up some areas, flooding others, and moving small sand islands that people call home.

Along these rivers and the low lying coastal regions it often isn't possible to build permanent hospitals.

One charity has turned to these rivers to solve the problem they create.

"The rivers go into the most remote, the poorest, the most unaddressed communities which the roads do not go to," explains Runa Kahn, executive director for the charity Friendship.

"Rivers [are] the best tools by which we can carry our care to the people. Hence, hospital ships."

One of Friendship's floating hospitals brings health care to remote areas of southern Bangladesh.

Donated in August 2011, The Rainbow Warrior II has been converted into a floating hospital, renamed the Rongdhonu.

It is fully equipped to provide these communities with simple treatments and medicines as well as eye, dental and other surgeries.

Abu Taher is one of the people these hospitals help. He has long-term problems with cataracts.

"I can see only with one eye. I can't walk properly and can't read anything. I can't even go to mosque to offer prayers," he explained.

The ship will allow him to receive free treatment he would not otherwise get.

"There is a government hospital in my village, but they don't offer any eye treatment," he said.

Along with two other ships in northern Bangladesh, the Lifebuoy Friendship Hospital and the Emirates Friendship Hospital, this hospital ship helps roughly 155,000 people each year.