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_97 (longest_span_in_s_metre___feet__ VARCHAR, land VARCHAR, name VARCHAR)

### Question ###
How long is the UK's Ballochmyle Viaduct?

### Accurate SQL ###

SELECT longest_span_in_s_metre___feet__ FROM table_name_97 WHERE land = "uk" AND name = "ballochmyle viaduct"