Between Hoy and Pomona are Hunda (8), Cava (17), and Graemsay (195), which has excellent soil and is mostly under cultivation.
Excepting on the west fronts of Pomona, Hoy and Rousay, the coast-line of the islands is deeply indented, and the islands themselves are divided from each other by straits generally called sounds or firths, though off the north-east of Hoy the designation Bring Deeps is used, south of Pomona is Scapa Flow and to the south-west of Eday is found the Fall of Warness.
The Lower Old Red Sandstone is represented by well-bedded flagstones over most of the islands; in the south of Pomona these are faulted against an overlying series of massive red sandstones, but a gradual passage from the flagstones to the sandstones may be followed from Westray S.E.
Eight other cities had populations of more than 5000 - Riverside City (7973), Vallejo (7965), Eureka (7327), Santa Rosa (6673), Santa Barbara (6587), San Bernardino (6156), Santa Cruz (5659), and Pomona (5526).
Sandstone is quarried on several islands, and distilleries are found in Pomona (near Kirkwall and Stromness).