Y tro hwn: Penrhyn Gwyr; Cwm Clydach, Rhondda; Chwarel Rhosydd uwchben Dyffryn Croesor, a Moel Famau, Sir Fflint. Who will win this week's walking contest: Heledd, Elis, Francesca or Emlyn?
48 o funudau
Gweld holl benodau Am Dro
