Why does the bathroom smell?

The drain has a U-shaped trap that holds water — a seal between your bathroom and the sewer line below. In Marrakech heat, that water evaporates fast, sometimes within a day. Once the trap is dry, sewer gas rises straight through the drain. Run the tap for ten seconds to refill it. The medina's sewage system is centuries old, and multiple properties share the same drainage channels — a blockage three doors down can push gases back through yours.