The Nabonidus Chronicle is preserved on a single clay tablet now kept at the British Museum in London. Like the other Babylonian Chronicles, it lists in an annalistic (year-by-year) fashion the key events of each year, such as the accession and deaths of kings, major military events, and notable religious occurrences. It follows a standard pattern of reporting only events of immediate relevance to Babylonia, making it of somewhat limited utility as a source for a wider history of the region. The tablet itself is fairly large, measuring 140 mm wide by 140 mm long, but is significantly damaged with its bottom and most of the left-hand side missing. The text was composed in two columns on each side, originally consisting of some 300-400 lines. What remains is extremely fragmentary; little more than 75 lines of text are still legible. The missing portions consist of most of the first and fourth columns, along with the bottom of the second and the top of the third. There appears to have been a colophon at the bottom of the tablet, but it too is largely missing.