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However , it unusually includes a large , roughly rectangular section of the western Severn Estuary ending at ( but not including ) the islands of Steep Holm and Flat Holm .
 location: Severn Estuary; location: Steep Holm; location: Flat Holm
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Severn Estuary, Steep Holm, Flat Holm 
Answer:
 location: Severn Estuary; location: Steep Holm; location: Flat Holm