Proceeding from the north entrance of Lerwick harbour, we find a light on Rova Head, with red, white and green sectors, guiding the mariner to and from this narrow channel. The sea is dotted with a number of rocks and holms, requiring a skilled pilot to negotiate. Towards the west open up the fine bays of Dales Voe, Laxfirth, Wadbister Voe and Catfirth; and off the point of Hawksness is the Unicorn rock, on which the ship that was chasing the Earl of Bothwell was wrecked (1567). [Illustration: Mavis Grind, looking south] Facing the bold promontory of the Mull of Eswick stands the Maiden Stack; to seaward the Hoo Stack and Sneckan; and extending eastward a succession of rocks and skerries, which go by the name of the “stepping stones.” Passing the bay of South Nesting, we approach the “bonnie isle” of Whalsay, with the fine bay of Dury Voe opposite. Between Whalsay and the land lie a number of isles, the largest being West Linga, while from the outer side, islands and rocks stretch in an easterly direction, the farthest group being called Out Skerries. The largest of these, Housay, Bruray and Grunay, are inhabited; while on a small isle, called Bound Skerry, is erected a fine lighthouse, which shows a bright revolving white light, visible a distance of 18 miles round. Passing Vidlin Voe and doubling the long promontory of Lunna Ness, we reach Yell Sound. On the right lies the island of Yell; on the left the triple openings of Swining Voe, Collafirth and Dales Voe; and further on Firths Voe and Tofts Voe, with the ferry of Mossbank between. After Orka Voe, we round Calback Ness and enter the fine bay of Sullom Voe, extending about eight miles inland. Only a narrow neck of land separates it from Busta Voe on the west, while a little to the northwards, at Mavis Grind, the distance between Sullom Voe and the Atlantic is only a stone’s throw. After Gluss Voe and the pretty bay of Ollaberry, Collafirth is reached, and then Burravoe, the farthest roadstead in Yell Sound. Looking back from this point, we view the whole Sound with its many isles and holms, low-lying, and affording good pasture for sheep. The largest are Lamba, Brother Isle, Bigga, and Samphrey. Near Samphrey are the Rumble Rocks, with a beacon to aid navigation. Returning to Yell Sound, we find on its north side the two harbours of Hamnavoe and Burravoe, in Yell. Proceeding north through the Sound, we pass the bay of Ulsta and the Ness of Sound. From Ladie Voe to Gloup Holm the coast is bold and rocky, with only one inlet, Whale Firth, which runs inland till it almost meets Mid Yell Voe. In the extreme north is Gloup Voe. Blue Mull Sound, which separates Yell from Unst, has the harbour of Cullivoe near the middle and Linga Island at the south entrance. On the east coast of Yell are the fine bays of Basta Voe and Mid Yell Voe, with the island of Hascosay between.