How many comments are there in the Bethel (CA) Borough area?
CREATE TABLE "table1_17978052_2" (
  "num_s_dam_and_gnis_query_link" real,
  "num_s_lake_and_gnis_query_link" real,
  "num_s_reservoir_and_gnis_query_link" real,
  "borough_or_census_area" text,
  "comment" text
);
SELECT COUNT("comment") FROM "table1_17978052_2" WHERE "borough_or_census_area"='Bethel (CA)';