A Place free of Restrictions of Transport [Mekom Petur]
Definitions
Such a place is above 10 Tefach [Hand-Breadths]: Shabbat 99b
Measurement of 10 Tefach [Hand-Breadths] in the Sea begins from the seabottom: Shabbat 100b
Status of an [elevated] area which has an area of less than four cubits by four cubits: Eruvin 9a, 76b-77a, 85b, 87a-b, 101b
