Corneria

Corneria is currently home to an estimated 85% of the total sentient population of the Lylat system but, due to careful planning, remains a verdant garden world. Its cities and industry were built while keeping in harmony with nature, allowing its rich ecosystem to flourish. It is implied from Star Fox Assault that some military bases might be Cornerian-made islands. Roads on Corneria seem to be built above the ground as to allow the plant life to thrive, and from space the planet looks to have a large amount of cloud cover and oceans. It is the center of culture and government of the Lylat system, and is a prime target for those seeking conquest over the galaxy.

Lylat Wars
Despite the relatively peaceful nature of its citizens, Corneria has always been a prime target for attack. In earlier times, the original Star Fox team, led by James McCloud, protected the world as mercenaries, with the help of the Cornerian Army. After James' apparent death, the renegade Andross struck against Corneria without warning after amassing an impressively large army. Due to the fact that a war from space had essentially never been waged on the planet before, and the fact that the military forces of the planet were small because the need for them had seemed absent, the Cornerian Army was largely unprepared for the attack. Thus, the army was unable to defend Lylat on its own. The responsibility then fell upon General Pepper to contact the new Star Fox team led by James' son, Fox McCloud, to intervene and save the Lylat system. Vanguard forces of the Androssian Army breached Corneria's defenses, but their advance through an old Cornerian military base was halted by the Star Fox team. Andross' forces were defeated on Corneria, saving the planet from further destruction.

The people of Corneria spent the next few years recovering and rebuilding, attempting the bring the planet back to its former glory. Several cites were hit hard by the attack, some being totally demolished. Roads had to be rebuilt and oceans had to be cleaned, among other things. Andross' forces, in all likelihood, fled the planet after Andross was defeated.