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_204_277 ( id number, "region" text, "country" text, "location" text, "size (m)" text, "payload (metric tonnes)" text, "degrees of freedom" number, "x horiz disp (mm)" number, "y horiz disp (mm)" number, "z vert disp (mm)" number, "x horiz vel (mm/s)" number, "y horiz vel (mm/s)" number, "z vert vel (mm/s)" number, "x horiz accel (m/s2)" number, "y horiz accel (m/s2)" number, "z vert accel (m/s2)" number, "max freq (hz)" text, "details checked" text )

### Question ###
how many tables are in asia ?

### Accurate SQL ###

SELECT COUNT(*) FROM table_204_277 WHERE "region" = 'asia'