Correction to: Estimating heavy metals absorption efficiency in an aqueous solution using nanotube-type halloysite from weathered pegmatites and a novel Harris hawks optimization-based multiple layers perceptron neural network

1 Correction to: Engineering with Computers https://doi.org/10.1007/s00366-021-01459-8

In the original version of the paper, the authors used Fig. 1 to describe the geological map of the study site. Unfortunately, some symbols in the original version were incorrect, and they were not match with the main text. Furthermore, the study site has not been shown in the geological map of the original version. Therefore, Fig. 1 was corrected as below:

Fig. 1

Geological map of Thach Khoan area

The original article has been corrected.