Plana is a lunar crater that lies on the boundary between two small lunar mares, with Lacus Mortis to the north and the larger Lacus Somniorum on the southern side. It is joined to the Mason crater to the east by a short stretch of rugged ground. Due north of Plana in the midst of the Lacus Mortis is the prominent Bürg crater.

a metal trowel like a plasterer's trowel in the UK, whereas a chapa is a wider plastic equivalent