Nantlle Vale were relegated from Ardal North West following Saturday’s crushing home defeat at the hands of Llanrwst.
Vale needed to win their final game by a huge margin to pip Y Felinheli on goal difference but ended up getting thrashed themselves and now go down along with Menai Bridge Tigers and Conwy Borough.
Llanrwst, meanwhile, clinched an impressive sixth spot by doing the double over Nantlle.
Callum Parry bagged his first hat-trick since returning to Parc Gwydir last October, 17-year-old Jonathan Richards scored twice and Luke Roberts added a single.
Zac Pike netting a consolation for the hosts.
Sub Les Davies rescued a point for Trearddur Bay with a typically towering 77th minute header.
It was an 18th goal of the campaign for the former Bangor City star, who at the age of 40 has enjoyed an impressive second season with the Bay.
Llannefydd took the lead on 47 minutes through Sam Jones.
Bay will finish fourth in the table in their debut Tier 3 season, with Llannefydd ending up in fifth spot.
An eight-match unbeaten run for a Hotspur side which had already secured runners-up spot and a promotion play-off berth came to an end at Y Traeth.
Third-place Port, who still have an Ardal Northern League Cup Final against Brickfield to come, sealed the points through goals from Danny Brookwell, Cai Jones and former Hotspur striker John Littlemore.
Cory Williams replied for the visitors with a 17th minute penalty after Brookwell had netted first for the hosts.
A cracking result on the road for Corwen, Pat Hinchliffe leading the charge with a hat-trick.
Dafydd Evans, Sam Henry and Robbie Williams added a goal apiece for the visitors.
Pwllheli had Dafydd Roberts red-carded after just 14 minutes, meaning they had to play the majority of the match with 10 men.
Just one league games remains – Trearddur Bay v Corwen on May 3
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