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_18600760_15 ( water__sqmi_ VARCHAR, county VARCHAR, geo_id VARCHAR )

### Question ###
How many square miles of water is in Ramsey County with a geo id larger than 3807159460.0?

### Accurate SQL ###

SELECT water__sqmi_ FROM table_18600760_15 WHERE county = "Ramsey" AND geo_id > 3807159460.0