There's no Telvanni settlements outside of Antediluvian Secrets and Telvannis. They're pretty much universally hated by everybody else so they keep to themselves. Sacred East has a very varied combination of various types of forest, swamps, coast and wilderness, with approximately 7 or so full settlements (perhaps more, I forget) and many more random collections of residential buildings and shacks, Indoril estates, dungeons and ruins etc. The only Great House present in Sacred East (besides perhaps a small number of every House in Necrom) is Indoril. Hope that answers your question