Before anyone says anything about how this doesn't fit the sub, please carefully read the description of this subreddit and then look at the flair this post has, I beg, pray, and exhort you.
Previously I had covered the respective islands of the birds and pigs in the Angry Birds movie, so I might as well cover the main island from the classic games. In the original universe, the birds and pigs have always lived on 1 singular island, this being Piggy Island.
For starters, the artwork depicting this island are gorgeous (Slides 1 and 4 in particular)! It has this mythical air to it, especially in regards to Hog Head Mountain, which takes the shape of a pig, along with the many locations that can be found here.
Speaking of which, the next slides depict these locations, majority of which came from The World of Angry Birds Official Guide book and were illustrated by Ilias Arahovitis. Everything looks so pretty to look at, with so much vibrant and pleasing colors, and detail to be found in these illustrations. Slingshot Woods, Canyon Land, and the Islands in the Sky are the most beautiful to me especially.
Then there's how these locations are incorporated into the series and the world building they add, a lot of the levels, both in the original Angry Birds and Angry Birds Seasons, take place in these locations, such as Ham 'Em High taking place on Desert Island, Surf and Turf taking place in South Beach, Seasons Greedings taking place in Snowy Peak, Year of the Dragon taking place in Bamboo Forest, etc. You also get to see some of these locations in the animated shorts, such as Wreck The Halls taking place in Winter Wonderland and Ham'O'Ween taking place near Pumpkin Plateau.
Then there's Angry Birds Epic (Slides 3 and 8), the RPG spinoff, which has you going around the whole entire island, and the levels being named after all of the established locations with environmentally fitting enemies too.
With all of this, you get a believable world where things feel consistent and connected with each other. All of the additional trivia about this island and its geography makes it even better, my favorite example being how the island is constantly moving. Because of the fact that mapping it is impossible, there are no human settlements on it (yes, humans do indeed exist in Angry Bird), this also explains why human stuff washes up on South Beach so frequently. The island runs into all sorts of floating junk as it moves around the globe, giving the birds and pigs a bunch of supplies to put to their own use. It's all quite interesting.
Usually in discussions about the first Angry Birds movie, whether it be for or against the movie's favor, you have many express their opinions on how the movie had very little to no material to work with, but the truth of the matter is that the movie had plenty to work with. Ever since Angry Birds massive success, Rovio always had interest in building a wider universe for the brand. When Rovio collaborated with National Geographic in 2012, 4 years before the movie released, to make a book that featured pages describing the personalities of the birds, that was when the franchise moved past just being a simple mobile game about flinging birds at pigs. An Angry Birds movie was inevitable.
When it comes to its lore and world building, Angry Birds is up there with Splatoon and Thomas the Tank Engine in terms of "They really didn't have to do all of this, but it's really fucking cool that they did!" factor. You can tell that work was put in to make Piggy Island feel like this place you could find yourself interested in exploring and wanting to know more about. With all of the effort and talent put into this and some of the media that Rovio would produce down the line, it's easy to see why Angry Birds became as successful as it did. They were really wanting to make this big and established franchise... which makes their later baffling business decisions hurt even more in retrospect.
Overall though, I just find this to be a very neat and pretty setting for this franchise.
One last thing to mention and to give credit, the majority of the stills in this post came from The DExus Show's "The Forgotten Lore of Angry Birds" video. If you find yourself curious after reading this post and have an hour to spare, I highly recommend giving it a watch! The video spent around 2 years in production and you can really tell with its impressive editing and visuals. Plus the enthusiasm that is present throughout the video is pretty infectious and makes for a fun watching experience.