Do you even have a D30? I know there is one somewhere in my dice bag... I can even remember where I bought it, not quite sure what I'd do with it!
Here is a collection of tables on which to give it a good workout. They are all aimed at helping the DM deal with all the vagaries of above-ground adventuring, and in particular to aid in the creation of wilderness maps for the party to wander across, not to mention the population of such maps with anything from scenic features to passing NPCs.
The really good thing is, that this product is not just tables. There is a wealth of information about how to use them to best advantage as well. Worksheets are provided to aid the world-building process, which can be a daunting task even if you are comfortable designing dungeons and their immediate environs. Indeed there are three of them, one for the general environment to enable a 'hex-crawl' exploration adventure, one for settlement development and one for NPCs. Used together, you will soon find the world taking shape, so that when the adventurers emerge from the dungeon there is something more than an inn to slake their thirst and somewhere to sell their loot and purchase supplies for the next trip!
In creating your world map, there are three levels of hexes: the 'atlas-level hex' that gives a broad overview, with each hex being 36 miles across and best used for countries or whole continents; the 'sub-level hex' that is around 6 miles across and good for wilderness explorations; and the 'detail-level hex' where a hex is but a mile across and you know exactly what is where. With systematic mapping, you can tell where anything is and shift focus in or out as needed to suit what is going on in your adventures. Each worksheet provides room for not only the map but your notes as well, anything from shopkeepers to wandering monsters and any other feature you want to record.
And then the tables. What do you want to create today? There are adventure generators, weather generators (those sheltered adventurers that have spent all their time on dungeon crawls will be surprised just how important weather becomes once you start an overland trek!), and even a nifty little section for determining how good their navigation is and how badly they have gone off course. Do not laugh, anyone who has seen my daughter getting lost will know how easy it can be! Characters out in the wilderness will need to eat and drink, and most will want to supplement whatever supplies they have with them with hunting and foraging - so there are tables for that as well.
If you are creating a map - whether in advance or on the fly - there are tables of natural features by terrain type, settlements and even a ruins generator to populate your map with. Temples, cults and magical places are not forgotten either, and it goes on: pilgrims, road encounters, castles and keeps, and even... a heraldry generator. Instant coats-of-arms at a few rolls of the dice. (The one thing it doesn't mention is the Rule of Tincture: do not place a metal on a metal or a colour on a colour - this just makes it easier to see what is on a shield, and so identify the owner, at a distance.)
As for settlements, there are plenty of tables to help there as well. Background, encounters, the composition of Watch or Town Guard patrols... and should said encounters go badly awry there's even a table of 'Methods of Torture and Execution" - don't think I want to go there! Moving on there are extensive tables for generating shops and taverns (even a tavern name generator and what entertainment or food you'll find there) and then a similarly-extensive set of tables for creating NPCs, including a separate section for sages...
Having looked this over, it looks virtually essential for anyone wanting to create a fantasy world (irrespective for the most part of rule system) who would like to take some of the donkey-work out of it. After all, you do not have to accept the results of any die rolls if something else would suit your intentions better, but as a starting point, a lot of the work can be done for you! Recommended.