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_189598_7 (population_density__per_km²_ VARCHAR, name VARCHAR)

### Question ###
When buffalo narrows is the name how many measurements of population density per kilometer squared are there?

### Accurate SQL ###

SELECT COUNT(population_density__per_km²_) FROM table_189598_7 WHERE name = "Buffalo Narrows"