Summary
The fence is meant to stop people from crossing the border without permission.
Environmental groups say the fence could damage the forest and the animals that live there.
Officials say they will try to protect both security and nature.
Fence length: 90 kilometres (about 55 miles).
Area: mangrove trees that grow in salty water at the border.
Goal: keep the border safe from illegal crossing.
Concern: possible harm to wildlife and forest health.
The fence is meant to stop people from crossing the border without permission.
Environmental groups say the fence could damage the forest and the animals that live there.
Officials say they will try to protect both security and nature.
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