Urban Fantasy vs Rural Fantasy in Children's Books

Over the last few years I've taken to writing children's novels that could be broadly categorised as "rural fantasy". I've published three such books, all of them set in the mid-1960s. Two of them are set in apartheid South Africa, while the third has a more international setting.

One of the motivations for writing such stories was a conversation between C.S. Lewis and J.R.R. Tolkien, in which they concluded that if they wanted to see more of the kind of stories they liked, they should have to write them themselves. I liked some of the stories they had written as a result, and also stories by their fellow Inkling Charles Williams, and ones by Alan Garner.

Alan Garner's first two children's stories, The Weirdstone of Brisingamen and The Moon of Gomrath were rural fantasy, but his third, Elidor ventured into urban fantasy. They are set in Manchester and neighbouring Cheshire in England. I liked them, but Alan Garner moved on to other things, and Lewis and Tolkien were dead, so I thought I'd have to write some myself.

Another motivation was to give South African children an idea of what life was like under apartheid, and rural fantasy seemed the best vehicle for that. One reason for that is that, by the very nature of apartheid, black children and white children had few opportunities to meet in towns. White children sometimes had opportunities to meet black adults, though mostly as domestic servants and therefore as social inferiors. Black children had even fewer opportunities to meet white adults. So I chose to set my children's stories in rural areas of the southern Drakensberg, where there were white farming families, and also some independent black peasant farmers who were not employed by whites, and therefore not servants, though they were under threat of removal from what the apartheid government had declared as "white areas".

But now I'm trying my hand at urban fantasy, which is a more recognised genre than rural fantasy, but also in some ways more difficult to write. So I wrote about a group of white children, who have few or no opportunities of meeting black children. And in the 1960s the only black people that most urban white children had an opportunity to meet were clergy, and that only if they knew white clergy who would introduce them to black clergy.

I thought I'd try setting my story in Johannesburg, mainly because that was where I happened to be living at that time and so was most familiar with it. But there are also disadvantages. Many urban fantasy novels feature things like underground railways and underground tunnels. and there was a shortage of those in Johannesburg in my period. The only underground tunnels that I was aware of was stormwater drains. And, in the southern parts, mines. I suppose one could make something of those.

Are there any other urban fantasy novels, esecially ones for children, set in Johannesburg? Or indeed in any other South African city? I would like to know how they handled some of these things.