As all living beings inevitably compete, history is replete with winners and losers.
Our present is determined by history's victors...choices made correctly leading to the proper prosperity in due course.
This is called Proper Human History.
The incorrect choices and incorrect prosperities are history's losers.
Dead-end human histories that were deemed unnecessary and interrupted...discarded even from Parallel World Theory...
Lostbelt No.1 The Grand Duchess of the Beast Nation
A.D. 1570? Permafrost Empire, Anastasia
Lostbelt No.2 The Good Fellow of Everlasting Flame
1000? B.C. The Eternal Icy Fire Century, Götterdämmerung
Lostbelt No.3 The Crimson Beauty under the Moon
210? B.C. The Synchronized Intellect Nation, SIN
Lostbelt No.4 The Final Dark God
?? 11900? ?? Saṃsāra of Genesis and Terminus, Yugakshetra
Lostbelt No.5 The Day to Bring Down Gods
12000? B.C. Ancident Ocean of the Dreadnought Gods, Atlantis
Interstellar Mountainous City, Olympus
Lostbelt No.6 The Moment a Planet Is Born
A.D. 500 Round Table Domain
???? B.C. Sea of Trees