Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_203_459 ( id number, "township" text, "fips" number, "population\ncenter" text, "population" number, "population\ndensity\n/km2 (/sq mi)" text, "land area\nkm2 (sq mi)" text, "water area\nkm2 (sq mi)" text, "water %" text, "geographic coordinates" text )

### Question ###
how many of the townships have their water area as 0 km ?

### Accurate SQL ###

SELECT COUNT("township") FROM table_203_459 WHERE "water area\nkm2 (sq mi)" = 0