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_name_94 ( geohash_length INTEGER, lat_bits VARCHAR, km_error VARCHAR )

### Question ###
What is the lowest geohash length when the lat bits are less than 7, and the km error of 2500?

### Accurate SQL ###

SELECT MIN(geohash_length) FROM table_name_94 WHERE lat_bits < 7 AND km_error = "±2500"