The Trent is unusual amongst English rivers in that it flows north -LRB- for the second half of its route -RRB-, and is also unusual in exhibiting a tidal bore, the '' Trent Aegir ''.
University of Wales Online Dictionary It is unusual amongst English rivers in that it flows north -LRB- for the second half of its route -RRB-, and is also unusual in exhibiting a tidal bore, the '' Aegir ''.