Haor is a shallow basin-shaped reservoir usually formed by landslides. They have water all year round. For example: Hakaluki. Baor is a reservoir created by changing the course of an old river or along the course of a river. For example: Joydia. Canals are man-made waterways for agriculture , transportation or other uses. For example: Suez Canal. The vast enclosed freshwater reservoir , which is full of water in the monsoon season but partially dried up in the dry season, is used here for farming and grazing. For example: challan bill. Halae lake is an abandoned ditch or reservoir of a river surrounded by land. For example: Hatirjheel. And to the left of the unclean six ponds.