Back of the islands are the quiet waters of lagoons, and at the mouths of rivers are several shallow bays indenting the mainland; these bays were formed by only a slight subsidence of the land and the rivers are filling them with deposits of silt.
Today the block style is most widely used because there is no indenting to bother with in the entire letter.
Instead of indenting, use space between paragraphs and create headings to help visitors find their way to the information they are looking for quickly and easily.