In PostgreSQL, the WAL can usually be found in the pg_wal directory in the data directory (unless specified otherwise on initdb). In older versions of PostgreSQL, the WAL directory was called pg_xlog, but with the introduction of PostgreSQL 10.0, the directory has been renamed. The reason for that is that more often than not, people would delete the content of the pg_xlog directory, which of course led to serious issues and potential database corruption. The community has therefore taken the unprecedented step of renaming a directory inside a PostgreSQL instance. The hope is to make the name scary enough that nobody dares to delete the content again.
The following listing shows what the pg_wal directory looks ...
