The grand canal was a large square canal separating the inner city of Forgeheart from the outer industrial districts. It was very wide, and was surrounded on both sides by sloping lawns with some houses on them, such as Jiru's House and Chap's House. The sloping lawns were later removed and made into flat plots elevated above the level of the river by about ten blocks. It was crossed originally in 5 places by the Nautilus Bridge, one of which was later replaced by the Sana Bridge. The canal was also widely thought of as the boundary of the Inner City.