Table schema:
CREATE TABLE table_17978052_2 (_number_s_dam_and_gnis_query_link INTEGER, borough_or_census_area VARCHAR)

Question: How many dams are there in the Lake and Peninsula area?
SQL: SELECT MAX(_number_s_dam_and_gnis_query_link) FROM table_17978052_2 WHERE borough_or_census_area = "Lake and Peninsula"