Anybody else having difficulty in this region?
26A Lake in north-west Russia (3,700 sq miles), the second largest in Europe (5) O- - - -
16D U.S. state (42,224 sq miles, population 7 million), sometimes called the Big Bend state (9)- I have TENNESSEE
19D A discourse on a theme (7) - I have DISSERT
Together those give 26A O-S-E but the second-largest lake in Europe is ONEGA (or ONEGO).
Where have I gone wrong?