What is the largest know ship ever made?

[Zerg]

Father Torms "Church" long lost relic from Torm Tech words cant do justice

 

[UNSC820]

Just to imply..the Star Wars Super Star Destoyer..was not the Largest ship that ever existed..A Ship i can think off the top of mine that was bigger than the Super Sat Destroyer was ther Covenant COS Super Carrier which was 29Km the biggest thing to ever exist which is from Halo again..is the Ark...surpassing the earth and every other thing ever made in a Sci-F game/movie

 

[Nuclear Doughnut]

We're talking SM Ships :P