Both Taieri and Alexandra finished with 18 points and the winner was decided by differential after the two day competition finished on the Taieri green.
Taieri won the contest with 18 points, 288 shots and had a differential of plus 60 and will advance to the national finals at Auckland later this month.
Alexandra fought back strongly to win its three games in the fifth and final round to finish with 18 points, 262 shots for a differential of plus 32, to finish second.
Timaru was third with 16 points, 277 shots and had a differential of plus 25 in the six team event.
The Taieri four of Jenny Dyhrberg, Jean Young, Loris Miller and Janet Swallow had four wins and lost its last game by only three shots, to Timaru 13-10.
The most experienced player in the team was Swallow, who was skip of the Bowls Dunedin intercentre fours team this year and has won a New Zealand fours title.
But she was not able to rescue her team on the final end against Timaru. She was two down on the head and saved one shot with her run at the head.
But it was not enough.
Another experienced player in the team was lead Jenny Dyhrberg who set up the front bowls. Young, at second, had a steady game and put bowls in place for Swallow.
The Taieri pair of Judy Robertson and Jan Barclay finished strongly and had three wins from their five games.
The 24-13 win in the last game against Meadowbank of Oamaru was important because it helped to firm up Taieri's differential.
Singles player Beth Brown had just two wins from her five games. But the last-round 25-17 win against Waverley's Marlene Orloski pushed the differential to a safe position.
The only unbeaten team in the two-day event was the Alexandra pair of Lyn Somerville and Linley O'Callaghan.
The winning division two team was the Arrowtown combination of Helen Bye (singles), Evelyn Dennison, Bev Menlove (pairs) and Joyce Edgerton, Judy Willis, Diane Brash, Jenny Heazlewood (fours).
Arrowtown won with 16 points and was followed by Logan Park and Business Women 12, the combined Southland team of Te Rangi 6 and Stirling 2.
Arrowtown and Taieri will represent region six at the New Zealand finals at Auckland on March 22 and 23.
In the men's finals in Oamaru, Kaikorai won all but one of its games, and was so dominant the final round of play was not required.
Mike Kernaghan took all four of his singles with wins over Meadowbank's Graeme Sangster (25-13), Waikiwi's Craig Merrilees (25-14) and Kia Toa's Jim Vevers (25-5) and Alexandra's Pat Houlahan (25-23).
Kaikorai's pair, skipped by Kerry Beck, also came through without a loss with wins over Alexandra's Graeme Soper (27-7), Kia Toa's Graeme Sanders (17-12), Kaitangata's Graeme Hislop (19-11) and Meadowbank's Bob Campbell (19-7).
Kaitangata finished second with 15 points. Its four, skipped by Neville Twaddle, won three of its four games. Waikiwi's four, skipped by Stu Dickson, had three wins to finish third.
In division two, Kia Toa qualified for the national finals with 16 points and a differential of plus-50, just ahead of Outram (16, plus-44). Tapanui was third and Meadowbank fourth.
