The SNP has struck deals to lead administrations in more councils.
The party has come to an agreement in Argyll and Bute, where its 12 councillors will work with independents, including local group Argyll First.
The move follows a deal reached in the Highlands on Tuesday night which brings the SNP together with Labour and the Liberal Democrats.
Labour said its role is yet to be ratified by the party's Scottish executive committee. The committee has already rubber-stamped an agreement to work with the SNP in Edinburgh.
Meanwhile, the nationalists are meeting Labour in Aberdeen on Wednesday for further talks.
Labour emerged as the biggest party in Aberdeen but have conflicting policies with the SNP on the future of the controversial plan to build over the city's Union Terrace Gardens.
Drew Hendry, SNP group leader at Highland Council, said: "The SNP looks forward to working in partnership with the Lib Dem and Labour councillors in the best interests of all the people in the Highland Council area.
"With this strong coalition I have no doubts the three groups can work well together, setting aside political differences to deliver for the Highlands.
"Our groups' policies along with the skill-sets of the elected members shall make for a winning blend and I am confident we will deliver."
The SNP will be the biggest group on Highland Council with 22 councillors to the Lib Dems' 15 and Labour's eight. There are 35 independent councillors.
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