IF you visit Kahayan Hilir, a forested village in the Pulang Pisau regency of Central Kalimantan, you will surely come across a kind of fenceor tabat in the local languagealong the river, made of rows of cajuput (Melaleuca leucadendra) tree trunks. The tabat, which acts as a barrier, runs across numerous points on the Kahayang River and is often covered with tarpaulin and dirt for reinforcement. A tabat can also be made of bamboo. When the dry se