Andelia's island is moderately sized, with high rocky cliffs falling directly into the deep sea on almost all sides. One side (the southwest) of the island has a gentler slope down to the water, where a arc of stone forms a breakwater around a small harbor and white sand beach. The breakwater is the surfaced section of a long stone and sand bar that stretches away to the south. The top of the island is a rather jumbled expanse of rocks and trees, large and small, it's probably 20-25 acres in size.
In the harbor is a small stone and timber dock, where a dinghy rests in davits on the end of the dock and a small blue sailing catamaran bobs in the waves tied off to a buoy beyond the dock. A second buoy, unused normally, bobs farther out in the little harbor.
Above the harbor sits a medium-sized stone house, the walls made of basalt blocks, the window and doorframes of pale granite, and the roof of grey-blue slate. Inside, there are four smallish guest rooms, a rather larger room for the owner, a study/office/library, a small living room, the kitchen, and a dining room that's sized for more serious entertaining than the rest of the house suggests. The doors are polished hardwoods, with bright brass fittings, while the floors are of contrasting patterns of hardwoods (except in the kitchen, which has a slate floor) and the windows are large panes of glass. A particularly large plate-glass sheet looks down over the harbor from the study and and the owner's suite on the second floor.
Attached to the house by a door on the second floor from the owner's suite is a small round tower that rises forty feet (approximately twice the height of the roof of the house) to the top of it's conical roof. Small window-slits (glassed in) circle up from the second-story connection to the room at the top, which has a series of window slits around it's circumference.