Swansea hill has a 20% gradient
Nid oes modd chwarae darnau sain a fideo ar eich dyfais

Mae'n riw serth iawn!

3 Ebrill 2017 Diweddarwyd 16:29 BST

People living on a road in New Zealand's Dunedin described this week what life is like on the "steepest residential street in the world".

At its steepest, Baldwin Street has a gradient of 35%, but Wales has some steep streets of its own.

Swansea's Constitution Hill, which features in the 1990s film Twin Town, has a gradient of 20%.