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_9778 ( "Rank" real, "Peak Name" text, "Elevation (ft)" real, "Range" text, "Isolation" real )

### Question ###
WHAT IS THE ELEVATION OF THE UNAKA MOUNTAINS, IN ROAN HIGH BLUFF PEAK, AND ISOLATION LARGER THAN 1.54?

### Accurate SQL ###

SELECT AVG("Elevation (ft)") FROM table_9778 WHERE "Range" = 'unaka mountains' AND "Peak Name" = 'roan high bluff' AND "Isolation" > '1.54'