Is this the only way to reach Lake Lappajärvi with public transport?

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This is my second question in a brief series on public transport in Finland.
After solving my Inari/Ivalo conundrum, I plan to move south. After a stop in Rovaniemi, I plan to go towards Tampere, and possibly stopping at lake Lappajärvi along the way.
It seems that I could get to Seinäjoki with the train, and then hop on a bus (with only one ride a day at 6 in the morning). Is this the only option?
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How to travel around Finland?
Here's our guide to the best ways to get around Finland, from Helsinki all the way to the Arctic Circle.How to get to Finland?
Swedish border is connected only to the northern Finland. That's why many travelers from Sweden use ferries or boats from Stockholm to southern Finland. The most common and easiest way into Finland is through the Helsinki-Vantaa airport. It's the main hub in Finland and there are many airlines that fly to Helsinki.Michał Łapaj - Shattered Memories (feat. Mick Moss) [Official Video]
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Images: Erik Mclean, Kei Scampa, Elena Saharova, Тамара Левченко